Overlap regulator for sequence-picture makers



Aug. 19, 1930. R. HUGERSHOFF 1,773,309

QVBRLAP REGULATOR FOR SEQUENCE PICTURE MAKERS Filed Aug. 30, 1929 Fig. .1

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for another cylinder with a diiierent pitch.

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' greater pitch may have the .the rotation can be Patented Aug. 19, 1930 UNITED STATES PATENT :OFFICE BEINEABD HUGERSH OFF, ,OF'DB-ESDEN, GERMANY,

PATENTVEBIWERTU INTERNATIONALE LIECHTENSTEIN, GERMANY nssreivon ro ovnnrar aneora'ron ron SEQUENCE-PICTURE mans Application filed August 30, 1929,

the apparent displacement of the helical line is equivalent to the speed with which the image of the landscape travels through the ima e field of the objective lens. Since the pitc of the helical line is constant, the re-. sultant speed of the driving shaft produces quite a definite overlap of the successive p'1ctures of a series, and corresponds, when the appliance is em loyed as a speedometer, to quite a definite ying height.

If it is desired to produce with the appliance a different overlapping ratio, the cylinder with the helical line must be exchanged helical line of a The pitch must for instance be greater, if a smaller overlap is prescribed, that is to say, when the photogra hs are to succeed one another more slow y, corresponding to the circumstance that with a greater pitch of the helical line the cylinder carrying that line must revolve more slowly in order that the helical line with a now same apparent velocity of displacement as the image 0 In order to avoid changing the cylinder provided with the helical line, according to the present invention the helical line is constructed as an elastic extensible spiral which is so arranged that it participates in the rotation of its cylindrical carrier, and during expanded at will. If such a device is employed as a speedometer, when the extensible spiral is employed, the special spleed regulator to be adjusted according to t e flying height can be dispense with. This is a ver important advantage, since, as known, all evices for continuously regulating a speed present considerable technical difliculties. sion of the spiral, an increase or in the pitch of the By merely altering the tendiminution helical line is now obment of the helica :lens is the Serial No. 389,592,.and. in was in: 7, 192a tained quite continuously and in a very simwith it an increase or dimparent speed of displaceline.

One constructional example of the invention is illustrated 'n ings, in which Fig. 1 shows a longitudinal section, partly in outside elevation and Fig. 2 shows aplan of the device.

Upon a driving shaft 1, which drives a driving shaft 2 by means of bevel gear 1, is arranged a cylindrical body 3, which is so ple manner, and inutlon 1n the a supported in a chamber-like casing 4 that "its axis coincides with the. ima objectve lens 6, constituted y terrupted ground lass plate. To the cylinder 3 is secured at .one end of a wire spiral 8. The other end is fitted to a ring 9, which e plane 5 of an is slidable alon the cylinder 3 and which, by

means of a gui ing groove 10, participates in the rotation of the cylinder 3. The displacement of the sliding ring 9 is effected b means of a guiding ring 11, which can be held fast in any desired position by a clamping screw 12. The position at any given time is read ofi by means of a pointer on a scale 13, shown in Fig. 2, the scale bein graduated according to the purpose for whic the device is to be employed, either according to the transmission ratio applicable to the pitch of the helical line, or accordin to the corresponding difference in flying eight.

What I claim is: r v

1. An overlap regulator for sequence picture makers, comprising an objective lens adapted to form an image of a tract of country over which the sequence pi ture making is moving, a cylinder rotatably mounted in an elastic spiral of varion the cylindrical surand means for varymounted ahle pitch said cylinder,

face of the d ing the pitch of the-elastic spiral while it is revolving with the cylinder on which it is mounted.

2. An overlap regulator for sequence picture makers, comprising an objective lens adapted to form an image of a tract of country over which the sequence picture maker a Suitably nran mam rxanus NGS AKTIENT ensnnnscm'r, or vsnuz,

the accompanying drawco I is moving, the said lens being fixedl connected with the sequence picture ma er, a cylinder rotatably mounted in the neighbourhood of the image field plane of the 0bj ective lens an elastic spiral of variable pitch mounted on the c lindrical surface of the seicl cylinder, ami means for varying the pitch of the elastic spiral while it is revolving with the cylinder on which it is mounted in testimony whereof I have signed my name to this specification.

R ENHARD HUGERSHOFF. 

